Wiring board provided with a resistor and process for manufacturing the same

Abstract

A wiring board provided with a resistor comprises: an insulating substrate having a surface; wiring patterns formed on the surface, the wiring patterns including first and second electrodes spaced from each other by a certain distance; a first resistor (horizontal type resistor) formed on the surface, the first resistor having respective ends connected with the first and second electrodes, respectively; the wiring patterns further including a third electrode, occupying a first plane area on the surface; a second resistor (vertical type resistor) formed on the third electrode; a fourth electrode formed on the second resistor; and the second resistor and the fourth electrode being located in a second plane area within the first plane area.

Description

technical field [0001] The present invention relates to a wiring board with resistors and a manufacturing method thereof, wherein the resistors formed on the wiring board can be adjusted. More particularly, the present invention relates to a circuit board having resistors formed of a resistive paste whose resistance value can be selected from a wide range and a method of manufacturing the same. Background technique [0002] In a wiring board having a semiconductor element thereon, a product is manufactured while incorporating a resistor in a substrate by printing a resistor paste such as carbon paste on the substrate. When forming a resistor by a screen printing method, a resistor paste is applied by printing according to a predetermined pattern, and the resistor paste is heated at a temperature at which the applied resistor paste is cured to form a resistor. [0003] Japanese Unexamined Patent Application 2001-085207 discloses a trimming method using a laser beam for adjus...

AI Technical Summary

Problems solved by technology

However, depending on the thickness and width of the electrodes, the thickness and / or width that determine the cross-sectional area of ​​the resistor is limited within the allowable range

In addition, even if it is desired to reduce the resistance value of the resistor by shortening the distance between the electrodes, it is difficult to adjust the resistance value of the resistor in a wide range because microprinting of resistive glue is not easy to do

[0005] Therefore, when the resistance value of the resistor used for the circuit board is distributed in a wide range, there is a problem that it is necessary to prepare a variety of glues with different resistance values, so that the formation of the resistor becomes cumbersome.

[0006] In addition, when a resin substrate is used and the resistance value of the resistor is adjusted by laser trimming, the resin substrate may be damaged by the laser beam, thus causing another problem that the formed circuit board is defective and the yield is low

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